I think social security in Shenzhen is better. Guangzhou Social Security and Shenzhen Social Security belong to social insurance, and the payment content is the same.
The difference between the two is only the payment base, because the payment base is related to the average social wage in the previous year. Generally, Shenzhen has a higher base than Guangzhou.
Legal basis: Article 12 of the Social Insurance Law of People's Republic of China (PRC): The employer shall pay the basic old-age insurance premium in proportion to the total wages of its employees as stipulated by the state and record it in the basic old-age insurance pooling fund.
Legal basis: Article 12 of the Social Insurance Law of People's Republic of China (PRC): Individual industrial and commercial households without employees, part-time employees who have not participated in the basic old-age insurance in the employing unit and other flexible employees who have participated in the basic old-age insurance shall pay the basic old-age insurance premium in accordance with state regulations.